Atomic Beam Research

VI. ATOMIC BEAM RESEARCH

Prof. J. R. Zacharias Dr. V. Jaccarino J. H. Holloway Prof. B. T. Feld R. T. Daly, Jr. Dr. J. G. King Prof. R. A. Satten D. S. Edmonds H. H. Stroke

R. D. Haun, Jr.

A. THE HYPERFINE STRUCTURE OF IODINE

The atomic beam magnetic resonance method has been used to investigate the 2P3/2 atomic ground state of the stable isotope of iodine. From observations of the Zeeman frequencies in a known weak magnetic field, the value of 5/2 h for the nuclear spin I has been verified. The zero field intervals have been obtained from measurements of the direct transitions 4, -2 - 3, -2, 3, 0 +- 2, 0, 2, 0 -+ 1, 0.

4a + 4/5 b + 576/5 c = 4225. 92 + 0. 100 Mc/sec 3a - 9/20 b - 1458/5 c = 1965. 886 + 0. 010 Mc/sec

2a - 4/5 b + 1728/5 c = 737.483

±

where a, b, c, are the magnetic dipole, electric quadrupole, and magnetic octupole interaction constants in the ground state, respectively. From these measurements we obtained the following values:

a = 827. 228 ± 0. 005 Mc/sec b = 1146. 215 + 0. 025 Mc/sec c < 0. 0002 Mc/sec

Q = -0. 796 x 10 cm

Calculations are at present being carried out to study the influence of the neighboring fine structure level, the metastable state 2P 1/2, on the hyperfine structure in the ground

state.

V. Jaccarino, J. G. King, R. A. Satten, H. H. Stroke